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Part number 550-142-330/0421
7
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 4 — Boiler Manual
HOMEOWNERandSERVICETECHNICIAN—readandfollowcompletely.
Troubleshooting
CommonproblemsCommoncausesPossiblecorrections
Rapid cycling -
burner
turns on and off frequently.
ermostat installed where dras or heat aect
reading.
Locate thermostat on inner wall away from heat sources or cool dras.
Heat anticipator setting in thermostat set
incorrectly.
Consult thermostat manufacturer instructions or set heat anticipator to
match current draw of circuit it is attached to. (Burner primary control, T-stat
switching relay coil, etc.).
Main and/or radiator vents not working properly
(one-pipe steam) or traps not working properly
(two-pipe steam).
Contact service technician to check, repair or replace air vents and traps.
Incorrect pressure limit setting. Set pressure cut-in and dierential according to system needs. Typical one and
two pipe systems need less than 2 psig. Typical cut-in setting is ½ -1 psi and
dierential of 1 psi. Try increasing dierential in ½ psi increments for longer
cycle times.
Frequent release of
water or steam through relief
valve.
Inoperative limit control.
If pressure in boiler is approaching 15 PSI, check pressure control setting,
operation & wiring. Replace if defective.
Incorrect or defective relief valve. Check for proper relief valve (15 psi). If opening at less than 15 psig, replace.
Needtofrequentlyadd
makeup water.
Leaks in boiler or piping.
Have qualied service technician repair leaks at once to avoid constant use of
makeup water.
Black or rust colored water
condition.
Black oxide or oxidation (rust) due to leaks in
boiler, air vents or piping. Improper pH.
Have qualied service technician repair leaks at once. Keep pH of water
between 7.0 to 8.5.
Popping or percolating noise
heard in boiler.
Mineral deposits in sections due to constant use
of makeup water. Or incorrect pH.
Have qualied service technician de-lime boiler and repair leaks at once to avoid
constant use of makeup water and check ph (7.0 to 8.5).
Metal flakes found in vent
outlet or vent — flue way
corrosion.
Contaminated combustion air supply. Remove any contaminating products. See page10 of this manual.
Provide outside air for combustion.
Condensation of combustion gases in ue ways. Have a qualied service technician check burner nozzle and oil pump pressure
for proper ring rate and check/adjust combustion settings with analyzer.
Some radiators or baseboard
units do not heat.
Main or radiator air vents (one pipe system) or
traps (two pipe system) not operating correctly.
Have qualied service technician inspect, repair or replace faulty air vents or
traps.
Incorrect pressure limit setting. Set pressure cut in and dierential according to system needs. Typical one and
two pipe systems need less than 2 psig. Typical cut in setting is ½ -1 psi and
dierential of 1 psi.
Clogged piping, valves or radiator. Or inoperable/
closed radiator valve.
Have qualied service technician clean or replace clogged components.
Water disappearing from
gauge glass and back into
system through return piping.
Incorrect Hartford loop piping. Have qualied service technician pipe boiler exactly as shown in boiler manual.
Check-valve inoperative. Have qualied service technician clean or replace check-valve.
Vacuum-breaker inoperative. Have qualied service technician clean or replace vacuum breaker.
Violent waterline fluctuations
surging
OR
Water passing into steam
mains priming.
Dirt, oil or other impurities in water. Have qualied service technician skim boiler.
Waterline too high. Have qualied service technician adjust waterline to normal height.
Incorrect piping. Have qualied service technician pipe boiler exactly as shown in boiler manual.
Sudden release of boiler steam pressure by action
of zone valves.
Have qualied service technician adjust valve operating time or install slow-
opening valves.
Domestic water from
tankless heater is hot then
suddenly turns cold.
Or
Domestic water from
tankless heater is always
lukewarm.
Mineral deposits insulate internal waterways of
heater.
Have qualied service technician delime or replace coil.
Boiler stop-leak compound has been added to
boiler water and is insulating outside of coil.
Have qualied service technician remove and clean coil and drain and ush
boiler to remove stop-leak.
Incorrect mixing valve setting for tankless heater. Have qualied service technician adjust mixing valve setting.
Domestic ow rate too high.
Have qualied service technician install ow check valve set to rating of
tankless heater.
Incorrect setting on tankless heater control.
Have qualied service technician raise tankless control setting. Adjust
dierential on tankless control to lower setting.
Homeowners — The problems and corrections below represent common situations that can occur.
There may be others not listed below. It is important always to contact a qualified service technician
if you have any questions about the operation of your boiler or system.
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